Plastic finials found, awesome for fences

I was going to paint the PVC and wood black, stick the finials on and then sponge greens/browns/etc on everything to make it look old/rusty/mossy. The finials wouldn't be completely painted, just some sponging. I have been oscillating on whether I could get away with paint since it wouldn't be full coverage or exposed to the elements for more than 3-4 weeks each year. (assuming the elements are what create the issue)

My front door has a huge glass oval with a plastic ridge that holds it in. There was a warning on the door not to paint it (when we replaced the first one that was stolen). The painters painted it anyway. It now has some beautiful and huge cracks from side to side in a couple places on it. Granted, we never remove it from the house so it is exposed to the elements constantly.

I was just going to just get the wrought iron ones but FE indicated a problem with exactly what worried me about them, weight.

Ironman is right, you need to sand or steel wool your pvc tubes just to take the shine off them. After that I laid mine all together on a table and used spray enamel (flat black ) then rolled them a quarter turn and sprayed them again, and rolled them again and so on. It saved paint and if you let them dry a minute or two between rolls they do just fine.
I got my iron finials from McF's. He shipped them in a bulk rate box so shipping was about $8.50 for about 30lbs of iron. My quess is the finials weigh about 1/4 pound each and I made my fence in eight foot sections. It's a little top heavy, but not a big problem. I set up my fence using 24 inch steel rod ( one foot in ground ) and slid the pvc over the rod at each end of a section and it worked fine. Conecting the section in some manor would also help stabilize the fence. Making them look rusty is just a painting issue.